干旱区生态环境知识资源中心(Arid): Deciphering groundwater flow-paths in fault-controlled semiarid mountain front zones (Central Chile)

Arid

DOI	10.1016/j.scitotenv.2021.145456
	Deciphering groundwater flow-paths in fault-controlled semiarid mountain front zones (Central Chile)
	Figueroa, Ronny; Viguier, Benoit; Taucare, Matias; Yanez, Gonzalo; Arancibia, Gloria; Sanhueza, Jorge; Daniele, Linda
通讯作者	Taucare, M (corresponding author), Univ Chile, Fac Ciencias Fis & Matemat, Ctr Excelencia Geotermia Los Andes CEGA, Santiago, Chile.
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2021
卷号	771
英文摘要	The Mountain-Block Recharge (MBR), also referred to as the hidden recharge, consists of groundwater inflows from the mountain block into adjacent alluvial aquifers. This is a significant recharge process in arid environments, but frequently discarded since it is imperceptible from the ground surface. In fault-controlled Mountain Front Zones (MFZs), the hydrogeological limit between the mountain-block and adjacent alluvial basins is complex and, consequently, the groundwater flow-paths reflect that setting. To cope with the typical low density of boreholes in MFZs hindering a proper assessment of MBR, a combined geoelectrical-gravity approach was proposed to decipher groundwater flow-paths in fault-controlled MFZs. The study took place in the semiarid Western Andean Front separating the Central Depression from the Principal Cordillera at the Aconcagua Basin (Central Chile). Our results, corroborated by field observations and compared with worldwide literature, indicate that: (i) The limit between the two domains consists of N-S-oriented faults with clay-rich core (several tens of meters width low electrical-resistivity subvertical bands) that impede the diffuse MBR. The hidden recharge' along the Western Andean Front occurs through (ii) focused MBR processes by (ii.a) open and discrete basement faults (mass defect and springs) oblique to the MFZ that cross-cut the N-S-oriented faults, and (ii.b) high-hydraulic transmissivity alluvial corridors in canyons. Alluvial corridors host narrow unconfined mountain aquifers, which are recharged by indirect infiltration along ephemeral streams and focused inflows from oblique basement faults. This study also revealed seepage from irrigation canals highlighting their key role M the recharge of alluvial aquifers in the Central Depression. The proposed combined geophysical approach successfully incorporated (hydro)geological features and geophysical forward/inverse modelling into a robust hydrogeological conceptual model to decipher groundwater flow-paths in fault-controlled MFZs, even in the absence of direct observation points. (C) 2021 Elsevier B.V. All rights reserved.
英文关键词	Mountain-block recharge Anthropogenic recharge Fault zone hydrogeology Hydrogeophysics Aconcagua Basin
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000627895900145
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/368755
作者单位	[Figueroa, Ronny; Yanez, Gonzalo; Arancibia, Gloria; Sanhueza, Jorge] Pontificia Univ Catolica Chile, Dept Ingn Estruct & Geotecn, Santiago, Chile; [Figueroa, Ronny; Viguier, Benoit; Taucare, Matias; Yanez, Gonzalo; Arancibia, Gloria; Daniele, Linda] Univ Chile, Fac Ciencias Fis & Matemat, Ctr Excelencia Geotermia Los Andes CEGA, Santiago, Chile; [Viguier, Benoit] Univ OHiggins, Inst Ciencias Ingn, Rancagua, Chile; [Taucare, Matias; Daniele, Linda] Univ Chile, Dept Geol, Fac Ciencias Fis & Matemat, Santiago, Chile
推荐引用方式 GB/T 7714	Figueroa, Ronny,Viguier, Benoit,Taucare, Matias,et al. Deciphering groundwater flow-paths in fault-controlled semiarid mountain front zones (Central Chile)[J],2021,771.
APA	Figueroa, Ronny.,Viguier, Benoit.,Taucare, Matias.,Yanez, Gonzalo.,Arancibia, Gloria.,...&Daniele, Linda.(2021).Deciphering groundwater flow-paths in fault-controlled semiarid mountain front zones (Central Chile).SCIENCE OF THE TOTAL ENVIRONMENT,771.
MLA	Figueroa, Ronny,et al."Deciphering groundwater flow-paths in fault-controlled semiarid mountain front zones (Central Chile)".SCIENCE OF THE TOTAL ENVIRONMENT 771(2021).